<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu 
        background-color="#333744" 
        text-color="#fff" 
        active-text-color="#409EFF" 
        unique-opened 
        :collapse="isCollapse"
        :collapse-transition="false"
        :router="true"
        :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区 -->
           <template slot="title">
             <!-- 图标 -->
             <i :class="iconsObj[item.id]"></i>
             <!-- 文本 -->
             <span>{{item.authName}}</span>
           </template>
           <!-- 二级菜单 -->
              <el-menu-item 
              :index="'/'+ subItem.path" 
              v-for="subItem in item.children" 
              :key="subItem.id" 
              @click="saveNavState('/'+ subItem.path)"
              >
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
      //左侧菜单数据
      menulist:[],
      iconsObj:{
        '125':'el-icon-user-solid',
        '103':'el-icon-s-management',
        '101':'el-icon-s-cooperation',
        '102':'el-icon-s-release',
        '145':'el-icon-s-marketing'
      },
      //是否折叠
      isCollapse:false,
      //被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  methods:{
    logout(){
      window.sessionStorage.clear();
      this.$router.push('/login')
    },
    //获取所有菜单
    async getMenuList(){
      const {data:res} = await this.$http.get('menus')
      if(res.meta.status !==200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    //点击按钮切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    //保存连接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    >div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }

  .el-main {
    background-color: #EAEDF1;
  }

  .iconfont {
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }

</style>